<div class="row">
    <div class="col-lg-6">
      <nb-card>
        <nb-card-header>课程在学人数分布</nb-card-header>
        <nb-card-body>
          <ngx-statistics-pie></ngx-statistics-pie>
        </nb-card-body>
      </nb-card>
    </div>
    <div class="col-lg-6">
      <nb-card>
        <nb-card-header>课程平均成绩</nb-card-header>
        <nb-card-body>
          <ngx-statistics-bar></ngx-statistics-bar>
        </nb-card-body>
      </nb-card>
    </div>
    <div class="col-lg-6">
      <nb-card>
        <nb-card-header>课程在学人数走势图</nb-card-header>
        <nb-card-body>
          <ngx-statistics-line></ngx-statistics-line>
        </nb-card-body>
      </nb-card>
    </div>
    <div class="col-lg-6">
      <nb-card>
        <nb-card-header>年度同期人数对比</nb-card-header>
        <nb-card-body>
          <ngx-statistics-multiple-xaxis></ngx-statistics-multiple-xaxis>
        </nb-card-body>
      </nb-card>
    </div>
    <div class="col-lg-6">
      <nb-card>
        <nb-card-header>各学科成绩分布</nb-card-header>
        <nb-card-body>
          <ngx-statistics-area-stack></ngx-statistics-area-stack>
        </nb-card-body>
      </nb-card>
    </div>
    <div class="col-lg-6">
        <nb-card>
            <nb-card-header>各科成绩对比</nb-card-header>
            <nb-card-body>
              <ngx-statistics-radar></ngx-statistics-radar>
            </nb-card-body>
          </nb-card>
    </div>
  </div>
  